(19)
(11) EP 2 351 626 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.05.2012 Bulletin 2012/22

(43) Date of publication A2:
03.08.2011 Bulletin 2011/31

(21) Application number: 11152891.5

(22) Date of filing: 13.10.2005
(51) International Patent Classification (IPC): 
B22D 11/115(2006.01)
(84) Designated Contracting States:
BE DE FR GB IT

(30) Priority: 15.10.2004 JP 2004300852

(62) Application number of the earlier application in accordance with Art. 76 EPC:
05795770.6 / 1837100

(71) Applicant: Nippon Steel Corporation
Tokyo 100-8071 (JP)

(72) Inventors:
  • Harada, Hiroshi
    Hyogo 671-1188 (JP)
  • Wakagi, Akinori
    Hyogo 671-1188 (JP)
  • Konno, Tomohiro
    Hyogo 671-1188 (JP)
  • Fujisaki, Keisuke
    Chiba 293-8511 (JP)
  • Hirayama, Ryu
    Chiba 293-8511 (JP)
  • Matsumori, Sumio
    Hyogo 671-1124 (JP)
  • Tomizawa, Yasuji
    Hyogo 671-1124 (JP)

(74) Representative: Vossius & Partner 
Siebertstrasse 4
81675 München
81675 München (DE)

   


(54) Production method of steel slab in a continuous casting process


(57) The present invention provides a method for producing a steel slab in a continuous casting process characterized by arranging a pair of electromagnetic stirrer coils facing each other outside of a mold within a depth of an immersion nozzle in molten steel in the mold, the electromagnetic stirrer coil having a yoke width B of 100 to 300 mm and a space factor of the yoke section area with respect to an inside area in a vertical cross-section of the electromagnetic stirrer coil of 0.5 to 0.9, forming a swirl in the molten steel by imparting thrust of the electromagnetic stirrer coils in opposite directions to each other, and molding the steel slab during stirring molten steel by the swirl, wherein a magnetomotive force F of the electromagnetic stirrer coil is 200 kAT or less and the magnetomotive force F divided by the yoke width B, F/B, is 800 kAT/m2 or more.







Search report